e l l . c o m

These modes are controlled by the position of the bus configuration switch when the system is turned on. Figure 3-2 illustrates the switch position for each mode.

w w w . d e l l . c o m s u p p o r t . d

Figure 3-1. Back-Panel Module Features and Indicators

bus configuration switch

power LED indicator

power LED indicator fault LED indicator active LED indicator

power LED indicator

fault LED indicator active LED indicator

primary

split-bus

secondary

EMM

module

EMM

The only difference between cluster mode and joined-bus mode is the SCSI ID occupied by the enclosure services processor. When cluster mode is detected, the processor SCSI ID changes from 6 to 15, allowing a second initiator to occupy SCSI ID 6. As a result, SCSI ID 15 is disabled, leaving 13 available hard drives in cluster mode. For more information about SCSI ID assignments and cluster mode operation, see your Dell PowerVault 220S and 221S Systems Installation and Troubleshooting Guide. See Table 3-3 for a description of the split-bus module modes and functions.

NOTE: To change the SCSI bus mode, you must change the position of the bus configuration switch before turning on the storage system. Using the bus configuration switch while the system is on does not affect system operation. If you change the bus configuration switch while the system is running, the change will not take effect until you perform the following sequence: shut down the nodes, reboot the storage system, and then turn on the nodes.

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Preparing Your Systems for Clustering

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Dell SE500W manual Primary Split-bus, Module

SE500W specifications

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